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The role of TGF-beta s in mammalian development and neoplasia
R J Akhurst1, D R Fitzpatrick, D J Fowlis
1Department of Medical Genetics, University of Glasgow, Yorkhill, Scotland.
Abstract:
To date, three mammalian TGF-beta isoforms have been identified, each encoded by different genetic loci. Through each is very similar in primary amino acid structure, there are clear differences both in the mature bioactive peptide region and in the latency-associated peptide, which could potentially confer differential biological specificity. As one route to investigate differential biological function in vivo we have used gene specific probes for in situ hybridization studies to examine the distribution of RNA transcripts during mammalian embryogenesis. Mouse embryos from 6 to 14.5 gestational age and human embryos from 32 to 57 days post-fertilization have been probed. A general conclusion from these studies is that each TGF-beta gene has a distinct, through overlapping, pattern of transcript distribution and that this pattern, in most cases, is conserved between mouse and man. We have focused on the biological function the TGF-betas play in certain epithelia and in cardiogenesis, which will be discussed in this presentation.
Insights
Three transforming growth factor-beta (TGF-β) isoforms exist in mammals, each with distinct RNA transcript patterns during embryonic development. These patterns are largely conserved between mice and humans, suggesting specific biological roles.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Three mammalian transforming growth factor-beta (TGF-β) isoforms are known, encoded by distinct genetic loci.
- While primary amino acid structures are similar, differences exist in bioactive peptide and latency-associated peptide regions, suggesting differential biological specificity.
Purpose of the Study:
- To investigate the differential biological functions of TGF-β isoforms in vivo.
- To examine the distribution patterns of TGF-β RNA transcripts during mammalian embryogenesis using gene-specific probes.
Main Methods:
- In situ hybridization using gene-specific probes.
- Analysis of mouse embryos (6-14.5 days gestational age) and human embryos (32-57 days post-fertilization).
Main Results:
- Each TGF-β gene exhibits a distinct, yet overlapping, pattern of transcript distribution during embryogenesis.
- These transcript distribution patterns are generally conserved between mouse and human embryos.
- Specific focus on the roles of TGF-β in epithelia and cardiogenesis.
Conclusions:
- TGF-β isoforms display unique spatial and temporal expression patterns during mammalian development.
- The conserved expression patterns suggest fundamental roles in embryonic development, particularly in epithelia and cardiogenesis.